<template>
  <div class="component-upload-image">
    <el-upload
      action="#"
      :http-request="httpRequest"
      :accept="accept"
      list-type="picture-card"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :disabled="disabled"
      name="file"
      :on-remove="handleRemove"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit || !this.showPlus }"
    >
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
      <template v-if="fileBigness">
        , 像素建议尺寸 <b style="color: #f56c6c">{{ fileBigness }}</b>
      </template>
    </div>

    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
      :class="needPreviewBack ? 'body-background' : ''"
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import { uploadFile } from "@/api/common";
import { compressAccurately } from "image-conversion";

export default {
  name: "ImageUpload",
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    accept: {
      type: String,
      default:
        "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,application/vnd.ms-excel,application/msword,application/vnd.ms-works,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/vnd.openxmlformats-officedocument.wordprocessingml.template,application/pdf",
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileBigness: {
      type: String,
      default: "",
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
    needFileName: {
      type: Boolean,
      default: false,
    },
    disabled: {
      type: Boolean,
      default: false,
    },
    // 显示添加区域
    showPlus: {
      type: Boolean,
      default: true,
      require: false,
    },
    // 需要预览背景色
    needPreviewBack: {
      type: Boolean,
      default: false,
      require: false,
    },
  },
  data() {
    return {
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(",");
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === "string") {
              item = {
                name: item,
                url: process.env.VUE_APP_BASE_API + item,
                fileName: item,
              };
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  created() {},
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 删除图片
    handleRemove(file, fileList) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList));
      }
    },
    // // 上传成功回调
    // handleUploadSuccess(res) {
    //   console.log(res);
    //   // this.loading.close();
    //   if (res?.code === 200) {
    //     if (res?.url) {
    //       this.fileList.push({ name: res?.newFileName || "", url: res.url });
    //       if (!this.needFileName) {
    //         this.$emit("input", this.listToString(this.fileList));
    //       } else {
    //         this.$emit("input", this.fileList);
    //       }
    //     } else {
    //       // 处理‘假’上传成功，重新渲染list数据
    //       // 深拷贝
    //       const newList = JSON.parse(JSON.stringify(this.fileList));
    //       this.fileList = [];
    //       this.$nextTick(() => {
    //         this.fileList = newList;
    //       });
    //       this.$message.error(`上传中断,系统开小差了(Maximum)`);
    //     }
    //   } else {
    //     this.$message.error(`上传失败`);
    //   }
    // },
    // 上传前loading加载
    handleBeforeUpload(file) {
      const that = this;
      let isImg = false;
      if (that.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = that.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        that.$message.error(
          `文件格式不正确, 请上传${that.fileType.join("/")}图片格式文件!`
        );
        return false;
      }
      // if (this.fileSize) {
      //   const isLt = file.size / 1024 / 1024 < this.fileSize;
      //   if (!isLt) {
      //     this.$message.error(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
      //     return false;
      //   }
      // }
      this.loading = this.$loading({
        lock: true,
        text: "上传中",
        background: "rgba(0, 0, 0, 0.7)",
      });
    },
    async httpRequest(params) {
      this.loading.close();
      const that = this;
      const imgType = params.file.type;
      const imgName = params.file.name;
      let sizeOver = params.file.size / 1024 > that.fileSize * 1024; //文件大小 是否大于指定大小
      if (sizeOver) {
        //大于限制进行压缩
        const res = await compressAccurately(params.file, {
          size: that.fileSize * 1024, //需要压缩的大小
          accuracy: 0.9, //精度 0.8-0.99之间 默认值0.95
          type: "image/png",
          width: 105,
          height: 105,
          // orientation: 2,
          scale: 0.5,
        });
        params.file = res; //把得到的新的图片文件赋值给原文件,然后进行上传   得到的是bold对象
        params.file = new window.File([params.file], imgName, {
          type: imgType,
        }); //将bold对象转换为file文件
      }
      const formdata = new FormData();
      formdata.append("file", params.file);
      uploadFile(formdata).then((res) => {
        if (res?.code === 200) {
          if (res?.url) {
            that.fileList.push({
              name: res?.newFileName || "",
              url: res.url,
              fileName: res.fileName,
            });
            if (!that.needFileName) {
              that.$emit("input", that.listToString(that.fileList));
            } else {
              that.$emit("input", that.fileList);
            }
          } else {
            // 处理‘假’上传成功，重新渲染list数据
            // 深拷贝
            const newList = JSON.parse(JSON.stringify(that.fileList));
            that.fileList = [];
            that.$nextTick(() => {
              that.fileList = newList;
            });
            that.$message.error(`上传中断,系统开小差了(Maximum)`);
          }
        } else {
          that.$message.error(`上传失败`);
        }
      });
    },
    // 文件个数超出
    handleExceed() {
      this.$message.error(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // // 上传失败
    // handleUploadError() {
    //   this.$message({
    //     type: "error",
    //     message: "上传失败",
    //   });
    //   this.loading.close();
    // },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].fileName + separator;
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}

.body-background {
  ::v-deep .el-dialog .el-dialog__body {
    background-color: rgba($color: #000000, $alpha: 0.2);
  }
}
</style>
